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There are 47 twenty-one-letter words containing 4O, P, T and U

autodephosphorylationautophosphorylationalautopolyploidizationschemolithoautotrophiccompact␣neighbourhoodscoordination␣compoundscourts␣of␣public␣opinioncyclophotocoagulationdisjoint␣union␣topologyellipsoid␣of␣revolutionesophagojejunostomiesfourth␣points␣of␣contacthow␣do␣you␣spell␣this␣wordimmunohistomorphologyimmunohistopathologicimmunopathophysiologyimmunophysiopathologyJoule-Thomson␣expansionmicrophotodisruptionsMormon␣funeral␣potatoesneurohistopathologistneuroophthalmologicalneuroophthalmologists neuro-ophthalmologistsneuropsychopathologicneuropsychotoxicologynucleophosphoproteinsophiocordycipitaceousorganoautotrophicallyosteochondroprecursorout-of-school␣suspensionparatopological␣groupsperfluorooctanoic␣acidphono-semantic␣compoundphosphogluconolactonephotolithoautotrophicphototautomerizationspolymorphonucleocytesprepositional␣pronounspropositional␣functionpseudoanthropomorphicpseudophosphorylationput␣the␣bottom␣rail␣on␣toprelations␣of␣productionsnoribonucleoproteinsspontaneous␣combustiontopological␣insulators

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 41 words
  • Spanish Wiktionary: 3 words
  • Italian Wiktionary: 2 words
  • German Wiktionary: no word
  • Portuguese Wiktionary: 2 words
  • Dutch Wiktionary: 6 words

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